Track-drilling machine.



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APPLICATlON FILED MAR. 19. 19M. 1,207,018. Patented Dec. 5,1916.

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APPLICATION FILED MAR. I9. I914. 13307 018.

Patented Dec. 5, 1916.

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UNITED STATES .PATENT OFFICE.

CHARLES E. GIERDING, OF MANSFIELD, OHIO, ASSIGNOR TO THE OHIO BRASS COMPANY, OF MANSFIELD, OHIO, A CORPORATION OF NEW JERSEY.

TRACK-DRILLING MACHINE.

Specification of Letters Patent.

Patented Dec. 5, 1916.

Application filed March 19, 1914. Serial No. 825,746.

To all whom it may concern:

Be it known that 1, CHARLES E. GIERDING, a citizen of the United States, residing at Mansfield, in the county of Richland and State of Ohio, have invented certain new and useful Improvements in Track-Drilling Machines, of which the following is a speci-.

fication.

My invention relates to drilling, boring machines, and the like, and more particularly to machines, of this character for drilling for milling bond holes in railroad rails.

One of the objects of my invention is to provide a machine of this character which will be simple, durable and reliable in construction, and effective and efficient in operation.

Other objects of my invention will appear hereinafter.

Referring to the accompanying drawings, Figure 1 is a plan view of a track or rail drilling machine embodying my invention. Fig. 2 is a view in side elevation thereof. Figsv 3 and 3, when placed end to end, constitute an enlarged vertical longitudinal section taken on line X X of Fig. 1. Fig.

l is an enlarged vertical transverse section taken on the line 4at of Fig. 2. Fig. 5 is a transverse vertical section of the feeding mechanism on line 5-5 of Fig. 3. Fig. 6 is a plan view, the top of the gear box being removed, on the line (3-6v of Fig. Fig. 7 is a vertical transverse section on line Z'-7 of Figs. 1 and 8. Fig. 8 is an enlarged longitudinal section .of one of the drill spindles, taken on the line SS of Fig. 7, and Fig. 9 is a transverse section through a portion of the ball of a rail showing one type of bond hole.

The particular machine shown in the drawings, which is an embodiment of my invention, is designed more particularly for drilling or milling bond holes in railroad rails, which are represented at A and A in Figs. 1 and 2. and the machine is so adjusted that it will drill holes in the outer face of the ball of the rail. The drills B (see particularly Figs. 8 and 9). in the structure shown are preferably in the form of hollow milling cutters so that they drill a. hole B in the ball of the rail, leaving a pin or integral part 1 of the rail in the center of the hole B, It is obvious,

however, that any suitable or desired type of drill may be used for this purpose. In bonding rails the holes for the bonds are usually provided on each side of the abutting ends of adjacent rails, and in order to save time in practice I provide a machine by means of which two holes may be simultaneously drilled, one on each side of the joint in the rail. These drills in the struc ture shown are properly spaced apart and are simultaneously actuated by the mechanism, which I will describe.

The machine shown in the drawings is arranged so that it will travel along the rail in order that it may be quickly transported from one rail joint to the next along the line. The machine preferably spans the rails, forming a track, and is preferably provided with rollers or wheels C and D. Accordingly I provide a frame which spans the track and which, at one side, projects beyond the rail and supports the drills and the actuating mechanism therefor. The other parts of the mechanism are supported by this frame between the two rails so as to produce a balanced structure. This frame in general has two parallel bars or members 1, which are spaced apart and which are joined at their inner ends'by a rigid yoke 2. From this yoke extends a bar or beam 3, one end of which, as seen more clearly in Fig. 3, is threaded into the yoke .2 and the other end of which serves as an axle for the supporting wheel or roller C which runs upon the rail A this wheel being properly held in position on said member 3 by means of two collars 4:, as shown clearly in Figs. 1 and 2. The outer ends of the parallel side members 1 of the frame terminate in integral L-shaped blocks 8 (Figs. 3 and l) of rectangular section. The horizontal legs or portions of these blocks lie substantially above the rail A, and the vertical legs or portions thereof depend or extend downwardly alongside the rail. So much of the frame as has just been described lies practically entirely above the rails and'carries the driving and feeding mechanism and other parts.

As before mentioned, this machine is designed to drill the bond holes in the outer face of the ball of one of the rails, the rail A, and in consequence the drills are positioned on the outside of the track preferably to move horizontally toward and from the ball of the rail A. For this reason I provide the frame with two other or additional parallel bars or members 9 which project beyond the rail A and which are preferably spaced apart substantially the same distance as the frame vmembers l. The inner ends see F i s. 1 and 2 are formed inte 'rall with the vertical legs of the L-shaped blocks 8, and their outer ends are bridged by a yoke 10. This yoke may, if desired, be provided with handles 11 to enable the machine to be easily and conveniently handled when lifting it on or off the tracks. Since the frame or extension members 9 project from the lower portions of the L-shaped blocks the plane in which they lie is positioned below the plane of the frame members 1, thus making it convenient for positioning the drills down into operating position and make a more compact and balanced structure. It is thus seen that the members 1 and 9 and the yokes 2 and 10 form a solid compact and unitary frame structure for supporting the other parts of the machine. This frame is further reinforced and strengthened by the brid e or cross member 8 which is fastened to the L-shaped blocks by bolts 8. On these outstanding members 9 of the frame I provide a bridge 12, which for convenience of description I will hereafter designate as the drill frame, and which is arranged to carry the drills and driving gears therefor. This drill frame is arranged to reciprocate or slide in a horizontal plane toward and from the face of the ball of the rail A, and for this purpose the drill frame has elongated sleeve bearings 13, which embrace the frame members 9 and which slide thereon. (Figs. 1 and 2.) The drill frame also has a central elongated bearing 14, which is positioned somewhat above the plane of the tops of the rails, and which supports the main driving and feeding shaft 15 (Figs. 3 and 7.) This bearing 14, as shown, has an inner bearing sleeve 16, which is removable and which has an annular groove 17, and holes 18, for carrying a lubricant from the oil cup 19, to the shaft. This main shaft 15 is retained against longitudinal movement in the bearing 14 by means of a collar 20, which is fastened to the shaft at the inner end of the bearing. Beyond theouter end of the bearing 14 the shaft carries a spur gear 21, which is keyed thereto and which is also held in place by a clamping nut 22, screwed on to the threaded outer end of the shaft 15. This shaft is not only arranged to drive the drills but it is also arranged to 'be shifted longitudinally to feed the drills into the rail and to withdraw them therefrom, as will be later explained. Therefore the parts are arranged so that the longitudinal movement of the main shaft 15 will shift the entire drill frame and the parts supported thereby. In order to take up the thrust exerted on the bearing 14 by the shaft incident to the drilling operations there is interposed an auxiliary bearing 23 on the shaft between the outer end of the bearing 14 and the gear 21. This auxiliar bearing is preferably in the form of a ball or roller bearing, as clearly shown in Fig. 3, so as to be better adapted for taking up the thrust. The gear 21 drives two smaller pinion gears 24 (Figs. 3 7 and 8) which are keyed to the outer ends of the drill spindles 25 and which are also held in position thereon by the nuts 26 threaded on the ends of the drill spindles 25. These drill spindles are supported in suitable bearings 27 formed in the sliding drill frame. These bearings, as in the case of the bearing 14, have removable bearing sleeves 28 and oiling passages 29 and 30 which are fed from the oil cups 31 through the passa es 32. It will be noted that the drill spinc ice are supported in the drill frame and in a horizontal plane which is properly posi tioned with respect to the outer face of the ball of rail A, and furthermore, these spindles are parallel and are preferably spaced apart the distance at which the holes in the abutting rails are to be drilled. The inner ends of these spindles are enlarged in diam eter to form drill-holding chucks or heads 33 (Fig. 8). The inner ends of the spindle bearings 27 are correspondingly enlarged to form sockets in which the drill heads or chucks 33 may rotate. Since the thrust on the drillsand spindles is necessarily considerable, due to the drilling o erations thrust bearings 35 are interposed between the chucks 33 and the shoulders 36 formed by enlarging the inner ends of the bearings 27. These thrust bearings are preferably in the form of ball or roller bearings, as clearly shown, which are found to be best adapted to the purpose. It will thus be seen that the spindles are held against longitudinal movement in their bearings 27 by means of the thrust bearings 35 at one end and the gears and clamping nuts 24 and 26, respectively, at the other end.

The chucks or drill heads 33 have central sockets or bores 37 into which the milling cutters or drillsB are inserted, said drills to be adjusted have sockets 4:1 in their inner ends for receiving the outer ends of the adjusting rods 39. The inner ends of the adjusting rods 39 (Fig. 8) bear against the ends of the drills B and consequently by screwing the adjusting bolts 40 into the end portions of the spindles the drills may be forced to project any distance beyond the noses of the chucks that is desired. This adjustment which has just been described enables the operator to accurately position the drills so that they will both commence drilling simultaneously and will drill holes of the same depth. Further, it enables the drills while the machine is in position, and the adjusting bolts 40 are accessible without disturbing the position of the machine. The dirt and grit are prevented from entering the gears on the drill frame and thereby interfering with their operation, by inclosing these gears in a suitable housing or box 13 which may be fastened in any desired manner on the drill frame. This housing is vertically divided into two sections which are held together by the bolts 4% thereby permitting access to be gained to the gears whenever desired. An oil cup 15 may be provided for each of the thrust bearings 35 of the drill spindles, as shown in Fig. 8.

In the machine shown in the drawings any suitable power may be employed for oper ating the drills. I illustrate an electric motor for this purpose, this being the most satisfactory, particularly when a source of electric current is available, such as in cases where the machine is used for drilling the rails of an electric railway system. It obvious, however, that hand power mechanism may be employed, if desired, and in fact such a form of mechanism constitutes subject matter of my copending application Serial No. 821,854, filed March 2nd, 1914:.

I show in connection with the machineherein described an electric motor which may be of any particular type and which is illustrated generally and referred to by the letter E (Figs. 1, 2, 3 and 1). This motor E is mounted on the frame preferably between the wheels or rollers which support the machine on the rail. The motor frame E has a suitable base E which is removably clamped upon a short standard E by means of the bolts E the standard E being preferably formed at the center of the inner yoke 2 of the frame. Rising from the top of the motor frame (Figs. 2 and 1) is a suitable switch F connected to a source of electric current and by means of which the current to the motor may be controlled. This switch may be of any suitable type connected to the overhead trolley wire or third rail system by a flexible conductor F These motor connections, however, need not be particularly described since it is obvious that any suitable means for bringing the current to the motor may be employed.

In the machine shown mechanical agencies are interposed between the motor and the drill and operating to drive and feed the drills, and these will now be described. The motor drives a spindle or shaft 53 which extends beyond the casing extension 55 and which is suitably journaled in said extension. This shaft 53 carries at its outer end portion a safety mechanism which, while it constitutes subject matter of my copending application above mentioned, is sufliciently shown and described in so far as it is necessary to render clear the operation of the drill driving mechanism. The shaft 53 is preferably positioned parallel with and directly above the main shaft 15, heretofore referred to, which shaft 15 (Figs. 3 and 3) extends to a point below the motor. Between said shafts 53 and 15 is a train of gears 56, 57 and 58 for transmitting the power from said shaft to the shaft 15. These gears and the safety mechanism parts are preferably all inclosed in a housing or casing 59 to protect the operators and to prevent the entrance of grit and dirt to the gears.

The gear 56 is loosely mounted for independent rotation upon a reduced portion 60 of the shaft 53, which extension extends through and considerably beyond the gear casing or housing 59. The shoulder 61 formed by reducing the diameter of the extension 60 of said shaft holds the gear 56 against longitudinal movement thereon. The face of said gear 56 opposite that face which abuts the shoulder 61 has a series of tapered teeth 62 which mesh with corresponding teeth on the end of a sleeve 63 mounted on said shaft extension 60 (Fig. 3). This sleeve, as is clearly seen, is keyed at 64.- to rotate with said shaft extension 60 but to slide longitudinally thereon, and it is held in yielding engagement with the teeth of the gear 56 by means of a coiled spring 65 surrounding said shaft extension 60 and abutting at one end against the sleeve 63. The outer end of the spring abuts against a collar 66 on the outer end of said shaft extension and this collar may be shifted along said shaft extension and fastened in its adjusted position by means of a set screw 67 whereby the pressure with which the sleeve 63 engages the gear teeth 62 may be regulated. It will thus be seen that the rotation of said gear 56 is imparted to it from the shaft 53 through the sleeve 63 of said safety mechanism, and the corresponding teeth 62 on the gear and sleeve are so formed that in the event the drills or any of the parts which the gear 56 drives become stuck or overloaded in any manner the spring 65 will permit the teeth of the gear 56 and sleeve 63 to The gear housing 59 is divided into two sections on a transverse vertical line 68 (Figs. 2, 3 and at) so that access may be readily gained to the parts inclosed thereby for inspection and repair. The upper portion of said casing is also divided on a horizontal line 69 so as to form a removable cap at the upper end thereof. The purpose of this construction is to permit the motor and safety mechanism to be removed or replaced as a unit with respect to the rest of the parts. This is obvious because the safety mechanism is mounted upon the shaft 53 and is thereby removable with said shaft. The gear casing 59 is provided, as is shown, with a hole or opening 70 for the sleeve 63, and it is also provided with a hole or opening 71 for the extension 55 of the motor gear casing 5 1. The inner edge of the opening 71 and the periphery of the end portion of the extension 55 are carefully machined so that the end of the extension will fit snugly in said opening 71 and thereby serve to hold the extension 55 and the motor against any relative movement. The gear 57, which is driven by the gear 56, is mounted on a suitable shaft 72 suitably mounted in the walls of the gear housing 59 and said gear- 57 is somewhat larger in diameter than the gear 56 so that said gear will be driven at reduced speed. The gear 57 meshes with and drives the gear 58, which is mounted upon the main shaft 15, which shaft passes entirely through said gear housing 59 but has suitable journals in the Walls thereof.

It is through the mechanism just described that the power of the motor is transmitted to the main shaft 15 for the purpose of driving said shaft, and hence driving the gears as heretofore explained. It will be remembered, however, that the feeding of the drills into the rail and the withdrawal thereof is accomplished by shifting the main shaft 15 longitudinally, and in consequence the gear 58. is splined, by means of the key 73 and key-way 7 4, so that it will not only drive the shaft 15 but will permit said shaft to be shifted longitudinally.

A bridge or yoke member 80 spans the members 1 of the frame and is positioned between the yoke 52 of the frame and the gear housing 59 (Figs. 1, 2, 3, 5 and This bridge is supported by the side me1 bers 1 of the frame which, as shown more clearly in Figs. 5 and 6, passes through the ends of the yoke or bridge. The bridge 80 is fastened in position on said frame members by means of the pins 81 so that it re mains fixed with respect to the frame. The bridge 80 is preferably in the form of two parallel members spaced apart so as to provide room thcrebetween for a number of gears, closed at the top by a cap 82 and at its lower side by a cap or cover 83 to completely inclose the parts and protect the operator as well as to protect the gears from grit and dirt. The main shaft 15 passes entirely through this bridge 80 and has a journal bearing 81 therein. This shaft carries two gears 85 and 86. One of these gears, the gear 85, is splined to the shaft 15 by means of the key 87 and key-way 74 which extends clear to the inner end. of the shaft, so that said gear will rotate with the shaft but will permit the shaft to slide longitudinally relatively thereto. The other gear, the gear 86, has an integral extension 88 which is journaled to rotate in a bearing 89 formed in. one of the side members of the bridge 80, as clearly shown in Fig. 3. This gear 86 is also threaded on the shaft 15 which, as shown in Fig. 3, is correspondingly threaded at its end portion so that if the gear 86 and shaft rotate relatively to each other the shaft will travel longitudinally relatively to the gear. The extension 88 of gear 86 extends beyond the bridge and is arranged in the form of a hand wheel 88 which rotates with the gear. A pair of companion gears 90, 91 are arranged within the bridge member 80 and mesh with the gears 85 and 86, respectively. The gears 90 and 91 are carried upon a shaft 92 and said gears are fastened together by means of the pins 93 so that they will always rotate together. The size of these four gears is so proportioned that when the shaft 15 rotates and drives the gear 85 the gear 86 will be driven at a slightly greater speed than the shaft. The threads on the shaft and gear 86 are so arranged that this slightly greater speed of rotation of the gear 86 relatively to the shaft will cause the shaft to travel longitudinally in the direction of the arrow Z (Fig. The shifting or moving of the shaft longitudinally in this manner, as before explained, shifts the drill frame and consequently feeds the drills as they are being rotated. These parts are so proportioned that the longitudinal movement of the shaft 15 will be just sufficient to properly feed the drills into the rail, and it is obvious that the feeding speed of the drills will always be in proportion to the speed ofv rotation thereof.

It may be well to say at this point that in the machine shown the speed ratio between the two gears 85 and 86 is accomplished by making the gear 86 a trifle smaller in diameter than the gear 85 and by making the gear 91 a trifle larger in diameter than the gear 90, and, of course, these differences in diameter vary the number of teeth in the respective gears. It is desirable in a machine of this character, for reasons which are obvious, to withdraw the drills from the rails in a much quicker period of time than that required for them to penetrate the rails. In the machine shown this speed of with drawal is accomplished by simply grasping hold of and stopping the rotation of the hand wheel 88 without stopping or reducing or even changing the speed of the driving motor or any of the other parts, and also by removing the gears 90 and 91 from mesh with the gears 85 and 86. By removing or disconnecting the gears 90 and 91 and stopping the gear 86 it will be seen that the gear 86 will in efiect act as a nut on said shaft 15, and the continued rotation of the shaft will cause it to travel longitudinally in a direction opposite to that of the arrow Z (Fig. 3), and the drills will thereby be quickly withdrawn. WVhen the gear 86 is stopped the relative speed of rotation of the shaft 15 is so great that the drills will be very quickly withdrawn. The speed of withdrawal, however, may be varied, if desired, and this variation may be accomplished by restraining the gear 86 so that it will rotate at a lesser speed than the shaft 15 instead of actually stopping the said gear, and this restraint may be placed upon the gear by simply allowing the hand wheel 88 to slip in the hand.

In order to provide a convenient means .for disconnecting the palr of gears 90 and 91 I mount their shaft 92 in a yoke or u-shaped frame 95 (Figs. 5 and 6) which is pivoted at 96 to the bridge member 80, this yoke being positioned outside of and embracing said bridge member 80. The wall members of the bridge have elongated slots 97 therein to allow for the movement of the gear shaft 92. The gear shifting yoke 95 has an upstanding handle or arm G by which it may be conveniently actuated. The four gears are maintained normally in mesh. A spring 98 is provided, one end of which is connected to the operating handle G and the other end is anchored to an upstanding post 99 on the bridge 80. The last men tioned end of the spring is connected to a screw threaded member 100 which carries a wing nut 101, and by means of this construction the tension of the spring may be varied. This spring yieldingly holds the set of gears in mesh but is preferably proportioned so that during the drilling operation the operator must exert an additional pressure upon the handle G to prevent the gears from slipping. This construction, in a sense, acts as a safety mechanism for the reason that should the operator leave the machine or forget to throw the gears 90 and 91 out of mesh the gears will slip when the resistance to the feeding operation of the gears becomes too great by reason of hard spots in the rail, or for any other reason. The hand Wheel 88 has a number of radial sockets 88 in its periphery into which may be inserted a suitable tool 88 (Fig. 3) for obtaining a greater turning leverage in case the gears become stuck.

The machine shown in the drawings is arranged so that it may be raised and lowered particularly with respect to the rail which is being drilled, and the purpose of this arrangement is to not only permit of a vertical adjustment of the drills with respect to the rail so that the bond holes may be accurately positioned, but also to permit the drilling apparatus to be raised somewhat while the machine is being transported from one location to the next. In this construction the L-shaped blocks or members 8 at the outer ends of the frame members 1, have outstanding ears or lugs 105 which serve as members upon which the wheel-holding levers are pivoted at 106. These levers are preferably in the form of bell-crank levers. The arms 107 of these levers carry the wheels D suitably mounted thereon at their lower ends. The other arm of one of the wheel-holding levers extends to a considerable distance upward in the form of a handle or operating arm 108, and the arm 109 of the other lever extends some distance above the pivotal point 106 of said lever. A link member 110 is pivotally connected at 111 to the arm 107 of one of the bellcrank wheel-holding levers and rises upward and then extends across and above the frame of the machine to the arm 109 of the bell-crank lever on the other side of the machine, to which arm 109 said link 110 is pivotally connected at 112. These parts, as is seen, are so arranged that by swinging the handle 108 to the right in Fig. 4 both bell-crank levers will be swung about their pivots 106 and the wheels D will be brought toward each other, thus lifting or raising the machine off of the rail A, and the machine is then free to be rolled along the track to the next place where bond holes are to be drilled. The link 110 has a curved dog 113 which is pivoted at 11% thereon. The free end of this dog drops in against a corner or shoulder 116 on the bridge 8 when the handle 108 is swung to the right to lift the machine, thus locking the parts against accidental displacement while the machine is moving from one place to another.

In order to vertically gage the position of the drill with respect to the rail there is shown a couple of vertically disposed threaded members or bolts 117 which are screwed into correspondingly threaded holes in the L-shaped members 8 and which project below said members. The lower ends of these bolts rest upon the top of the rail A, as shown more clearly in Fig. 3 and by manipulating these adjusting screws the machine may be adjusted vertically, as desired. The heads of these bolts have transverse pins or arms 118 forming handles by which these screws may be conveniently manipulated.

A convenient depth gage such, for instance, as is shown more particularly in Figs. 1, 3 and 4 of the drawings, may be provided for determining the depth to which the drills penetrate the rails. member 8 is curved upwardly at its top center portion (Fig. 4t) so as to pass over the main shaft 15. Upon this upper curved portion is a flat plate 120 which lies parallel with the main shaft 15 and directly above it and which may be clamped in place upon the bridge 8 by a winged nut 121 and threaded bolt 122, the plate 120 having an elongated slot to allow for its longitudinal adjustment with respect to the bolt 122. One end 123 of this plate drops downwardly to a point adjacent the periphery of a circular collar or gage member 124 which is mounted on the main shaft 15. This collar may, if desired, also be adjusted along the shaft 15 and held in its adjusted position by means of the set screw 125. It will be remembered that the shaft 15 moves longitudinally to feed the drills into the rail, and it will thus be seen that the relative move ment of the collar 124 on the shaft with respect to the end 123 of the gage plate 120 serves to indicate the depth to which the drills penetrate the rail. This gage arrangement is on the upper part of the machine so that it may be clearly seen at all times by the operator and may be conveniently set by him. The L-shaped members 8, as before explained, extend down alongside of and bear against the face of the rail ball which is being drilled. These portions of the frame operate in conjunction with members 7 to form rail clamps for clamping the machine to the rail to prevent relative movement of the machine with respect to the rail during the drilling operations. The members 7 are positioned on the side of the rail opposite to that which is being drilled and are mounted to slide on the side members 1 of the frame. The clamping force required for the purpose is obtained by means of the nuts 6 which operate on the threaded portions 5 of the frame members 1. The clamping faces of the L-shaped members and the members 7 have hardened steel gripping plates 131 thereon, and the upper ends 7 of the members 7 project over and slide on the L-shaped members 8 so as to take the twisting thrust on the members 7 incident to the clamping operations.

In connection with a machine of this character it is often desirable to carry tools and supplies of various kinds, and if desired, a suitable box or receptacle H may be mounted in place on the machine, such, for instance, as shown in Figs. 1 and 2, the tool box being mounted on the member 3' of the frame.

What I claim is:

1. In a track drilling machine adapted to span the rails of a track, the combination with a movable drill frame extending over The bridge the rails at one side of the track, drills carried thereby tooperate on the outer side of the adjacent rail, and means for bodily raising and lowering that side of the track drilling machine 011 which the drill frame is carried about the opposite rail as an axis.

2. In a track drilling machine, the combination with a frame adapted to span the rails of a track, a single supporting wheel at one end of the frame, a pair of supporting wheels at the other end of the frame, a movable drill frame extending beyond the rails at the last named end of the frame, drills carried thereby for operating on the outer side only of the adjacent rail, and means connecting the said frame and the two wheels at one side thereof for bodily lifting the frame and the said drill frame to clear the rail at this side of the track only.

3 In a track drilling machine, the combination with a frame adapted to span the rails of a track, of a drill frame movable therein extending beyond the rails at one side of the track and movable bodily up and down with the first mentioned frame and laterally toward and from the adjacent rail, and drills carried thereby adapted to operate on the outer side of the said adjacent rails.

4. In a track drilling machine, the combination with a wheel-supported frame spanning the rails of a track, of a drill frame movably supported on the other frame and extending over the rail at one side of the frame, a block secured to the said frame adapted when the frame is moved to be moved into engagement with the outer side of the rail to be drilled, a movable bearing member adapted to engage the inner side of the rail to be drilled, and drills carried by the drill frame operative to penetrate the rail to be drilled at the outer side thereof.

5. In a track drilling machine, the combination with a vertically movable wheel-supported frame terminating at one end with members adapted to be bodily moved therewith into engagement with the outer side of one of the rails, clamping members movable on the frame to engage the inside of said rail, a drill frame supported by and movable on the first said frame extending over and beyond the rail to be drilled, and drills carried thereby to operate in the outer face of the rail.

6. In a track drilling machine, the combination with a rigid wheel-supporting frame terminating at one end in a rigid member movable to engage the outer side of one of the rails of' a track, movable clamping means supported by the frame to engage the inner side of said rail, a drill frame supported from said member and offset with respect to the first mentioned frame, drills carried by the drill frame to operate on the outside of the rail to be drilled, and means supported by the first mentioned frame operative to move the drill frame and to rotate the drills.

7. In a track drilling machine, a wheelsupported frame structure spanning the rails of the track, and means for clamping the frame to the sides of one of the rails, said means comprising a block at one end of the frame extending over the rail and movable with the frame to engage the outer side of the rail, and a clamping member mounted on the frame between the rails and movable to engage the inside of the said rail.

8. In a track drilling machine, a wheelsupported frame structure spanning the rails of a track, means for clamping the frame to the sides of one of the rails, said means comprising a block at one end of the frame forming a strengthening part thereof and movable to engage the outer side of one of the rails, and a clamping member supported by the frame between the rails and movable against the said rail at the inside thereof, and a drilling mechanism carried by said block and projecting from the side of the track adjacent the rail to be drilled.

9. In track drilling mechanism, a wheelsupported frame structure spanning the rails comprising a block at one end of the frame movable to engage the outer side of one of the rails, means in connection with the frame for engaging the other side of the said rail to hold the frame in position with respect to the track, and a drill frame supported by the said block and positioned beyond the rails in aplane below the plane of the wheel-supported frame.

10. In track drilling mechanism, the combination with a wheel-supporting frame adapted to span the rails of a track com prising a member at one end of the frame movable to engage the outer side of the rail to be drilled, a clamping member supported by the frame between the rails and movable to engage the inner side of the rail to be drilled, thereby holding the said frame against movement transversely of the track in either direction, a drill frame supported by the member beyond the rails, and drilling mechanism carried by the drilling frame operative to engage the outer side of the rail to be drilled.

11. In a track drilling mechanism, the combination with a wheel-supported frame spanning the rails and having an offset drill frame projecting beyond the rails at one side, a clamp comprising a jaw fixed to the frame for engaging one side of a rail to be drilled, and a movable member carried by the frame to engage the other side of a rail to be drilled, means for raising and lowering the frame and said fixed clamping member for placing and removing it in and from the rail engaging position, and drilling mechanism carried by the offset portion of said frame.

12. In a track drilling machine, the combination with a wheel-supported frame adapted to span the rails of a track, a drill frame supported thereby and projecting beyond the rail to be drilled, drilling mechanism mounted upon the drill frame, mechanism between the wheel-supports and the frame for raising and lowering the frame and drilling mechanism with respect to the rail, a rail clamp comprising a member fixed to the frames and having a portion to engage the outside of the rail to be drilled when the frame is lowered, and a movable member carried by the frame to engage the side of the rail to be drilled for holding the frame immovable with respect to the rail when the frame is in its lowered position.

13. The combination of a pair of rails and a portable drilling machine adapted to travel on said rails and comprising a substantially rectangular frame embodying side bars and end connecting members, said side bars being formed in two sections, L- shaped blocks to which the adjacent ends of said side bars are connected, said L-shaped blocks being positioned to engage the outer side of the rail to be drilled, movable clamp members between the rails cooperating with said L-shaped blocks to clamp the frame to the sides of the rail to be drilled, and drilling mechanism carried by said frame.

1 1. The combination with the rails of a track and a portable drilling machine adapted to travel along said track and having a frame, means supporting said frame on one of said rails, a pair of wheels adapted to run along the other rail with pivotal levers on said frame and on which said wheels are mounted, a handle for actuating one of said pivotal levers, and a link connecting both of said pivotal levers for actuating said levers simultaneously to raise and lower the machine with respect to the rail.

15. The combination with the rails of a track, a substantially horizontal rectangular frame spanning said track, a wheel for one end of said frame adapted to run on one of said rails, a lever pivoted on each side of said frame at the other end thereof, one of the arms of one of said levers being elongated to form an operating lever, wheels carried by said levers adapted to run on said other rail, and a link connecting both of said levers for simultaneous operation to raise and lower the frame relatively to the rail.

16. The combination with the rails of a track and a portable drilling machine adapted to travel along said track and having a frame, means supporting said frame on one of said rails, levers pivoted on the framefa pair of wheels adapted to run along the other rail and mounted on said levers, means for moving said pivotal levers to raise and name to this specification, inthe presence of lower the frame on the wheels relatively two subscribmg Witnesses, on this 6 day of to the rail, and an adjustable stop extenc- March A. D. 1914.

ing from the frame and adapted to engage CHARLES E. GIERDING. 5 the rail to limit the lowering movement of l Vitnesses:

the frame. R. G. AVERIL In testimony whereof I have signed my JNO. L. YOUNG.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

